Meniscus Tears Explained for Active Patients

If you have been told you have a meniscus tear or if you are experiencing unexplained knee pain, locking, or swelling after a sports injury,  you are not alone. Meniscus tears are among the most common knee injuries seen in active individuals, and the good news is that with the right diagnosis and treatment, most people can return to the activities they love.

This guide explains what the meniscus is, how it gets injured, what to expect in terms of symptoms, and your treatment options.

What Is the Meniscus?

Inside each knee joint are two C-shaped pieces of specialised cartilage: the medial meniscus (on the inner side of the knee) and the lateral meniscus (on the outer side). These act as shock absorbers between the thigh bone (femur) and the shin bone (tibia), distributing the load across the joint during walking, running, and jumping. 1

Beyond cushioning, the menisci also play an important role in:

• Joint stability: deepening the surface of the tibia so the femur sits more securely
• Lubrication: helping distribute synovial fluid across the joint
• Proprioception:  providing the knee with sensory information about its position

This is why losing meniscal tissue, whether through injury or surgery, has meaningful long-term consequences for knee joint health.

How Does a Meniscus Tear Happen?

Meniscus tears can occur in two distinct ways:

1. Acute (Traumatic) Tears:  Common in Athletes

These typically occur when the knee is twisted or rotated while the foot is planted on the ground, a very common movement in sports like:

• Football and cricket
• Tennis and badminton
• Kabaddi and wrestling
• Skiing

A sudden squat, deep pivot, or tackle can generate enough force to tear the meniscus, especially in an awkward position. Acute meniscus tears often occur alongside other knee injuries such as an ACL tear. 2

2. Degenerative Tears: Common in Older Adults

In patients over 40, meniscus tears can occur with relatively minor movements, such as rising from a low chair or squatting, because the meniscus becomes less resilient with age and wear. These are not sports injuries per se, but they are very common and just as clinically significant. 3

Types of Meniscus Tears

Meniscus tears are classified by their pattern, which influences treatment decisions:

The location of the tear within the meniscus is also critical:  the outer one-third (the "red zone") has a blood supply and has better healing potential, while the inner two-thirds (the "white zone") is avascular and heals poorly on its own. 4

Symptoms of a Meniscus Tear

Immediately After Injury

• Pain along the joint line on the inner or outer side of the knee
• Swelling that may develop gradually over 24–48 hours (unlike ACL tears, where swelling is rapid)
• Difficulty fully bending or straightening the knee

Over the Following Weeks

• Clicking, catching, or clunking sensations within the knee
• Locking: the knee suddenly getting stuck and unable to straighten fully; this is a hallmark of a large "bucket handle" tear where a fragment of meniscus has flipped into the joint
• Giving way: a feeling of instability, particularly on uneven ground
• Pain when squatting, kneeling, or pivoting
• Persistent swelling that increases with activity and settles with rest

It is worth noting that some small meniscus tears, particularly horizontal degenerative tears, may produce only mild or intermittent discomfort, and some people are unaware they have a tear until it is identified on an MRI performed for another reason. 5

Diagnosis

Clinical Examination

A knee specialist will examine the joint carefully, looking for:

• Joint-line tenderness: pressing on the inner or outer aspect of the knee
• McMurray's test: rotating the tibia while extending the knee to provoke a click or pain
• Thessaly's test: a weight-bearing rotational test
• Range of motion assessment and evidence of an effusion (fluid in the joint)

MRI Scan

MRI is the investigation of choice, providing a detailed view of both menisci, confirming the tear, identifying its type and location, and assessing whether there are any associated injuries (such as an ACL tear or cartilage damage) that need to be addressed. 6

Treatment Options

The right treatment for a meniscus tear depends on several factors: the type of tear, its location within the meniscus, your age, your activity level, and any associated injuries.

Non-Operative Management

Many meniscus tears, particularly small, stable tears in the outer (vascular) zone, or degenerative tears in older patients, can be managed successfully without surgery:

• Rest, ice, compression, and elevation (RICE) in the acute phase
• Physiotherapy: targeted exercises to strengthen the quadriceps, hamstrings, and hip muscles; restore range of motion; and reduce strain on the knee
• Activity modification: avoiding deep squats, heavy loading, and high-impact activities during recovery
• Anti-inflammatory medication: used short-term for pain and swelling management

Research has shown that physiotherapy is often as effective as arthroscopic surgery for degenerative meniscus tears in middle-aged patients, particularly those without mechanical symptoms (locking). 7

Arthroscopic Surgery

When non-operative management fails, or when the tear is causing significant mechanical symptoms, arthroscopic (keyhole) surgery is indicated.

Meniscal Repair: For tears in the vascular outer zone, particularly in younger patients with acute longitudinal or bucket-handle tears, a repair may be possible. The surgeon uses small sutures or specialised implants to hold the torn edges together, allowing the tear to heal. Preserving the meniscus is always preferred, as it protects the knee from future wear. 8

Healing after a meniscal repair typically requires 4–6 months of rehabilitation, with restricted weight-bearing in the early weeks.

Partial Meniscectomy: When the tear is in the avascular inner zone, is complex, or is of a pattern that cannot be repaired, the surgeon will remove the damaged portion of the meniscus arthroscopically, leaving as much healthy tissue as possible. Recovery from a partial meniscectomy is generally faster, with most patients returning to activity within 6-12 weeks. 9

Total (complete) meniscectomy, removing the entire meniscus, is now very rarely performed, as it significantly increases the risk of long-term joint damage.

The Importance of Preserving the Meniscus

One of the most important principles in modern sports orthopaedics is preserving the meniscus. Long-term studies have demonstrated that patients who undergo total meniscectomy have a significantly elevated risk of developing knee osteoarthritis within 10–20 years. 10

At our practice, we prioritise repairing meniscal tissue wherever technically feasible, particularly in younger, more active patients, to protect long-term knee joint health. This often means accepting a longer rehabilitation period in exchange for a better long-term outcome.

Returning to Sport

With appropriate treatment and a structured rehabilitation programme:

• After partial meniscectomy: Most patients can return to full sporting activity within 6-12 weeks
• After meniscal repair: Return to sport typically occurs at 4-6 months, following objective assessment of strength and function.

A key principle in modern sports medicine is that return to sport is based on achieving specific, measurable criteria, not just time elapsed since surgery. This helps ensure the knee is genuinely ready, reducing the risk of re-injury.

Key Takeaways

• The menisci are vital shock absorbers and stabilisers of the knee joint
• Tears can occur from acute sports injuries or degenerative wear
• Symptoms include joint-line pain, swelling, clicking, locking, and giving way
• Diagnosis is confirmed with clinical examination and MRI
• Treatment ranges from physiotherapy to arthroscopic repair or partial meniscectomy, depending on the tear type and patient factors
• Preserving meniscal tissue is a key priority, particularly in younger patients

If you are experiencing knee symptoms that concern you, particularly locking, persistent swelling, or pain with activity, we encourage you to seek a specialist assessment.

References

1. Fox AJ, et al. "The basic science of the meniscus: structure, composition, function and repair." Sports Medicine and Arthroscopy Review. 2012;20(1):3–9. https://doi.org/10.1097/JSA.0b013e3182420d86
2. Levy IM, et al. "The effect of medial meniscectomy on anterior-posterior motion of the knee." Journal of Bone and Joint Surgery (American). 1982;64(6):883–888. https://doi.org/10.2106/00004623-198264060-00010
3. Englund M, et al. "Incidental meniscal findings on knee MRI in middle-aged and elderly persons." New England Journal of Medicine. 2008;359(11):1108–1115. https://doi.org/10.1056/NEJMoa0800777
4. Arnoczky SP, Warren RF. "Microvasculature of the human meniscus." American Journal of Sports Medicine. 1982;10(2):90–95. https://doi.org/10.1177/036354658201000205
5. Zanetti M, et al. "Patients with suspected meniscal tears: prevalence of abnormalities seen on MRI of 100 symptomatic and 100 contralateral asymptomatic knees." AJR American Journal of Roentgenology. 2003;181(3):635–641. https://doi.org/10.2214/ajr.181.3.1810635
6. De Smet AA, Graf BK. "Meniscal tears missed on MR imaging: relationship to meniscal tear patterns and anterior cruciate ligament tears." AJR American Journal of Roentgenology. 1994;162(4):905–911. https://doi.org/10.2214/ajr.162.4.8141015
7. Katz JN, et al. "Surgery versus physical therapy for a meniscal tear and osteoarthritis." New England Journal of Medicine. 2013;368(18):1675–1684. https://doi.org/10.1056/NEJMoa1301408
8. Pujol N, et al. "Meniscal repair versus meniscectomy for isolated meniscal lesions in active young adult patients." Knee Surgery, Sports Traumatology, Arthroscopy. 2015;23(1):116–121. https://doi.org/10.1007/s00167-014-3245-0
9. Monk P, et al. "The effectiveness of arthroscopic surgery for knee pathology: a systematic review and meta-analysis." British Medical Bulletin. 2017;121(1):91–108. https://doi.org/10.1093/bmb/ldw052
10. Lohmander LS, et al. "The long-term consequences of anterior cruciate ligament and meniscus injuries: osteoarthritis." American Journal of Sports Medicine. 2007;35(10):1756–1769. https://doi.org/10.1177/0363546507307396